Also worth noting for newbies that you can toggle the display of the movement points (MPs)/defensive values; I really find it far more helpful to have the defensive values displayed but others may feel differently.

The colored corners on the units represent a selected level of something - you can toggle between fuel (probably the most common), morale, supply and experience. Very helpful particularly when on defense to get a sense of how much mobility your opponent has.

This is very helpfull , thanks for writing. Especially mountain troops and soviet anti-tank guns is good knowledge. As rrbill have mentioned those topics would also be helpfull. And additionally my question is does sec divisions and other divisions lose trucks when far from command&corps hq? Supposedly they are on converted rail full of supply.